ML20245A156
| ML20245A156 | |
| Person / Time | |
|---|---|
| Site: | Peach Bottom  |
| Issue date: | 04/14/1989 |
| From: | Danni Smith PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| IEIN-86-016, IEIN-86-16, NUDOCS 8904250080 | |
| Download: ML20245A156 (2) | |
Text
g CCN-89-14056 f5 -
PIIILADELPHIA ELECTRIC COMPANY-IE PIMCil IKTIV)M A'IOMIC POWER STATION R. D.1,11ox 208
% [tf.
Delta, Penns3 hunia 17314 i
nacu monow-utt nma or tscrutNct (717) 15 4 701i D. M. Smith Vice President
]
i April 14, 1989 Docket Nos. 50-277 i
50-278 U. S. Nuclear Regulatory Commission Attention: Document Control Desk Washington, DC 20555
SUBJECT:
Peach Bottom Atomic Power Station. Units 2 and 3 Adequacy of DC Power Supply
REFERENCE:
Telephone discussion between W. V. Johnston (NRC) and R. J. Lees (PEco) on April 14, 1989
Dear Sir:
The purpose of this letter is to document commitments which were made by the Philadelphia Electric Company (PECo) in the above referenced telephone discussion.
In response to the Special Electrical Team Inspection (50-277/89-07 and 50-278/89-07) and NRC Information Notice 89-16, PECo has prepared preliminary calculations for the Unit 2 dc power system which demonstrate the system's capability to respond to a design basis accident with a coincident loss of off-site power. These calculations were reviewed by the NRC and found to be acceptable. However, PECo and the NRC have agreed upon the need to confirm the methodology used in the calculations through testing. Accordingly, PECo commits to the following:
1.
A one-minute battery discharge test will be performed on a Unit 2 battery. This test will be conducted at the initial inrush current value based on the calculation. The battery voltage will be measured to validate an acceptable terminal voltage.
2.
Tests will be performed to validate voltage drops consistent with the calculation results. The tests will include a power circuit to a de motor operated valve and a limiting case de control circuit.
They will be conducted at normal voltage levels. The test data will then be extrapolated to confirm the voltage drop at reduced voltage levels.
8904250o80 890414 R
ADOCK 05000277 PDC l l 1
l
.,.... o To: NRC Document Control Desk Page 2 These tests will be performed prior to the end of the next Unit 2 refueling outage (between Cycles 8 and 9). PECo will perform these tests prior to this date if there is an outage of sufficient duration which commences after July 17, 1989. The interim period will allow for preparation and review of the test procedures and blocking, and to support the Unit 2 Restart Power Testing Program.
If you have any questions regarding these commitments, please do not hesitate to contact us.
Sincerely, DMS:jlw cc:
W. T. Russell, Regional Administrator, Region I, USNRC J. C. Linville, Section Chief, Region I, USNRC W. V. Johnston, Deputy Director, DRS, Region I, USNRC F. Rosa, Branch Chief, NRR, USNRC T. P. Johnson, Senior Resident Inspector, USNRC R. E. Martin, Project Manager, NRR, USNRC T. Gerusky, Commonwealth of PA T. Magette, State of Maryland J. Urban, Delmarva Power J. T. Boettger, Public Service Electric and Gas H. C. Schwemm. Atlantic Electric I
I i
- _ - _ _ _ _ _ - - - _ _. - _ _ _ _ _ _ _ _ _ - - _ _ _ _ _ - - _ - _.